大约有 6,000 项符合查询结果（耗时：0.0305秒） [XML]
ORDER BY the IN value list
I have a simple SQL query in PostgreSQL 8.3 that grabs a bunch of comments. I provide a sorted list of values to the IN construct in the WHERE clause:
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How to Join to first row
...ROM LineItems
WHERE OrderID = Orders.OrderID
)
In SQL Server 2005 and above, you could just replace INNER JOIN with CROSS APPLY:
SELECT Orders.OrderNumber, LineItems2.Quantity, LineItems2.Description
FROM Orders
CROSS APPLY
(
SELECT TOP 1 LineItems.Quan...
Relational table naming convention [closed]
...rd Filing Systems [characterised by Record IDs which are implemented in an SQL database container for convenience):
the tables are the Subjects of the database, thus they are nouns, again, singular
the relationships between the tables are the Actions that take place between the nouns, thus they ar...
How to return result of a SELECT inside a function in PostgreSQL?
I have this function in PostgreSQL, but I don't know how to return the result of the query:
2 Answers
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How to organize a node app that uses sequelize?
...rdinarily you would use select from two or more tables, or a union in pure SQL, you would have to run separate queries, and with the async nature of Node it's just added complexity.
Therefore I moved away from using Sequelize. Moreover I am switching from using ANY data fetching from DB in the mod...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...条请牢记：
■计划好哪个连接是DTE，哪个是DCE，它们各包括什么类型，牢记你在这两台电脑上各使用了哪个端口（1还是2）。
■制作正确的null modem线。制作null modem线有多种方法，采用不同的方法做出来的线都是不一样的。
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Bulk insert with SQLAlchemy ORM
Is there any way to get SQLAlchemy to do a bulk insert rather than inserting each individual object. i.e.,
10 Answers
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Does Entity Framework Code First support stored procedures?
...E" statements in your code.
For EF 4.2:
var customers = context.Database.SqlQuery<Customer>("select * from customers")
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What is the difference between UNION and UNION ALL?
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Both UNION and UNION ALL concatenate the result of two different SQLs. They differ in the way they handle duplicates.
UNION performs a DISTINCT on the result set, eliminating any duplicate rows.
UNION ALL does not remove duplicates, and it therefore faster than UNION.
Note: While us...
Mapping composite keys using EF code first
Sql server table:
4 Answers
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